Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 23-10-2021 and time 19:26:48 (Italy) in region 4 km E Monte Cavallo (MC)

A magnitude ML 0.9 earthquake occured in region: 4 km E Monte Cavallo (MC), on

  • 23-10-2021 17:26:48 (UTC)
  • 23-10-2021 19:26:48 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9850, 13.0510 at 11 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Monte Cavallo MC 4 145 145
Pieve Torina MC 7 1458 1603
Fiordimonte MC 7 202 1805
Visso MC 7 1107 2912
Ussita MC 8 444 3356
Pievebovigliana MC 9 866 4222
Fiastra MC 10 559 4781
Muccia MC 11 915 5696
Acquacanina MC 11 121 5817
Preci PG 12 724 6541
Serravalle di Chienti MC 13 1070 7611
Castelsantangelo sul Nera MC 13 281 7892
Bolognola MC 14 142 8034
Sellano PG 15 1079 9113
Camerino MC 17 6974 16087
Sefro MC 20 422 16509

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Foligno (57155 inhabitants)
56 Km E of Perugia (166134 inhabitants)
57 Km NE of Terni (111501 inhabitants)
64 Km NW of Teramo (54892 inhabitants)
76 Km NW of L'Aquila (69753 inhabitants)
80 Km SW of Ancona (100861 inhabitants)
96 Km S of Fano (60888 inhabitants)
100 Km NE of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 0.9 2021-10-23
17:26:48		 42.9847 13.051 11 2021-10-23
17:34:37		 Sala Sismica INGV-Roma 96914041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 17:26:48 ± 0.06
Latitude 42.9847 ± 0.0036
Longitude 13.0510 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96914041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 421
Semi-minor axis of confidence ellipse (meter) 249
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 29
Circular confidence region, given by single value of horizontal uncertainty (meter) 420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 118
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29228
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 96914041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 17:34:37
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SENA.HHZ. 2021-10-23T17:28:43.73 3.0 undecidable manual Sg 11.01 0
IV.ORI.HHZ. 2021-10-23T17:28:36.21 3.0 undecidable manual Sn 4.17 0
RD.PGF.BHZ. 2021-10-23T17:28:21.68 3.0 undecidable manual Sn 8.4 0
CR.STON.BHZ. 2021-10-23T17:27:41.16 3.0 undecidable manual Pn 6.79 0
IV.VIVA.HHZ. 2021-10-23T17:27:35.61 3.0 undecidable manual S 2.76 0
IV.PAOL.HHZ. 2021-10-23T17:27:30.61 3.0 undecidable manual Pg 7.36 0
IV.TST02.HHZ. 2021-10-23T17:27:30.64 3.0 undecidable manual S -1.13 0
IV.IOCA.HHZ. 2021-10-23T17:27:24.01 3.0 positive manual Pn -1.07 0
IV.CSNT.HHZ. 2021-10-23T17:27:11.04 3.0 undecidable manual P 1.18 0
IV.MURB.HNZ. 2021-10-23T17:27:04.01 3.0 undecidable manual S -0.42 0
IV.ASSB.HHZ. 2021-10-23T17:27:00.40 0.3 undecidable manual S 282 32.4453 50 0.4 66
IV.ARRO.EHZ. 2021-10-23T17:26:59.66 3.0 negative manual P -0.34 0
IV.GUMA.HHZ. 2021-10-23T17:26:58.40 0.6 undecidable manual S 69 24.6531 50 0.49 44
IV.MMO1.EHZ. 2021-10-23T17:26:57.56 0.3 undecidable manual S 113 24.3534 50 -0.27 69
IV.MC2.EHZ. 2021-10-23T17:26:55.14 0.1 undecidable manual S 126 13.875 128 0.29 93
IV.MML1.EHZ. 2021-10-23T17:26:55.14 0.1 undecidable manual S 336 15.6732 124 -0.23 94
IV.NRCA.HHZ. 2021-10-23T17:26:55.74 0.1 undecidable manual S 163 17.5713 121 -0.17 95
IV.CSP1.EHZ. 2021-10-23T17:26:55.79 0.1 undecidable manual S 46 17.2716 122 -0.04 98
IV.MF5.EHZ. 2021-10-23T17:26:55.65 3.0 undecidable manual S -1 0
IV.GUMA.HHZ. 2021-10-23T17:26:54.11 0.1 undecidable manual P 69 24.6531 50 0.05 96
IV.ASSB.HHZ. 2021-10-23T17:26:54.93 0.1 undecidable manual P 282 32.4453 50 -0.33 90
IV.CESI.HHZ. 2021-10-23T17:26:54.57 0.3 undecidable manual S 281 12.0768 131 0.19 72
IV.MMO1.EHZ. 2021-10-23T17:26:53.80 0.6 positive manual P 113 24.3534 50 -0.21 47
IV.FDMO.HHZ. 2021-10-23T17:26:53.10 0.1 undecidable manual S 27 6.4935 149 -0.02 100
IV.PP3.EHZ. 2021-10-23T17:26:53.99 3.0 undecidable manual S -0.2 0
IV.NRCA.HHZ. 2021-10-23T17:26:52.79 0.6 negative manual P 163 17.5713 121 -0.11 48
IV.CESI.HHZ. 2021-10-23T17:26:52.08 0.1 undecidable manual P 281 12.0768 131 0.06 98
IV.CSP1.EHZ. 2021-10-23T17:26:52.78 0.1 undecidable manual P 46 17.2716 122 -0.07 97
IV.MC2.EHZ. 2021-10-23T17:26:52.51 1.0 negative manual P 126 13.875 128 0.22 24
IV.MML1.EHZ. 2021-10-23T17:26:52.53 1.0 undecidable manual P 336 15.6732 124 -0.06 24
IV.FDMO.HHZ. 2021-10-23T17:26:51.39 0.1 undecidable manual P 27 6.4935 149 0.1 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHE. ML:1.0 0.000143 0.14 AML other m 2021-10-23T17:26:53.25
IV.FDMO.HHN. ML:0.9 0.0001125 0.12 AML other m 2021-10-23T17:26:53.28
IV.CESI.HHN. ML:0.9 0.00008175000000000001 0.12 AML other m 2021-10-23T17:26:54.66
IV.CESI.HHE. ML:0.8 0.00006915 1.04 AML other m 2021-10-23T17:26:55.63
IV.MML1.EHN. ML:0.7 0.00004675 0.26 AML other m 2021-10-23T17:26:55.60
IV.NRCA.HHE. ML:1.0 0.0000752 0.12 AML other m 2021-10-23T17:26:55.82
IV.MML1.EHE. ML:0.8 0.000052699999999999993 0.94 AML other m 2021-10-23T17:26:56.47
IV.NRCA.HHN. ML:1.0 0.0000732 1.68 AML other m 2021-10-23T17:26:56.00
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download